Fuzzy Control Language: Difference between revisions

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'''Fuzzy Control Language''', or '''FCL''', is a language for implementing [[fuzzy logic]], especially [[fuzzy control]]. It was standardized by IEC 113161131-7. It is a [[___domain-specific programming language]]: it has no features unrelated to fuzzy logic, so it is impossible to even print "[[Hello world program|Hello, world!]]". Therefore, one does not write a program in FCL, but one may write ''part'' of it in FCL.

== Example ==

FCL allows the programmer to specify [[fuzzy set]]s, which are lists of points on a graph, as well as IF-THEN rules, for example:

RULE 0: IF (Temperaturetemperature IS Coldcold) THEN (Outputoutput IS Highlow)

RULE 1: IF (temperature IS very cold) THEN (output IS high)

== Limitations ==

FCL is not an entirely complete fuzzy language, for instance, it does not support "hedges", which are adverbs that modify the set. For instance, the programmer cannot write:

RULE 0: IFIf (Temperature ISis VERY ColdCOLD) THENthen (Output is VERY HighHIGH)

However, the programmer can simply define new sets for "very cold" and "very high". FCL also lacks support for higher-order fuzzy sets, subsets, and so on. None of these features are essential to fuzzy control, although they may be nice to have.

== External link ==

* [http://ffll.sourceforge.net FFLL] - an implementation library written in C++.

==References==

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{{reflist}}

== External link links==

* [http://www.fuzzytech.com fuzzyTECH], a commercial fuzzy logic development system containing the specification document for IEC1131-7 (select Fuzzy Application Library)

* [http://www.fuzzytech.com/binaries/ieccd1.pdf IEC 1131-7 CD1] {{Webarchive|url=https://web.archive.org/web/20210304150537/https://www.fuzzytech.com/binaries/ieccd1.pdf |date=2021-03-04 }} IEC 1131-7 CD1 PDF

* [http://code.google.com/p/fuzzylite fuzzylite], A fuzzy logic controller library written in C++.

* [http://ffll.sourceforge.net Free Fuzzy Logic Library (FFLL)] -, an implementation library written in C++.

* [http://jfuzzylogic.sourceforge.net JFuzzyLogic], open source FCL + Fuzzy Logic Package (sourceforge, java)

* [https://sourceforge.net/projects/awifuzz AwiFuzz], open source implementation written in C++ covering all three levels of IEC 61131-7 Fuzzy Controller Language

*[https://pyfuzzy.sourceforge.net/ pyfuzzy], open source implementation written in python.

[[Category:Domain-specific programming languages]]

[[Category:Fuzzy logic]]

[[Category:Domain-specific programming languages]]

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